The e nergy-saving effectiveness of preheating charge is 2.86 times better than that of preheating the air for burning, with the same heat recuperated from the fu me.

• 预热炉料的节能效果优于预热助燃空气。从烟气中回收同样数量的热量，预热炉料的节能效果是预热助燃空气的2.；86倍。